Tool/DigestCommands.m

/*
     File: DigestCommands.m
 Abstract: Commands for MD5 and other digests.
  Version: 1.0
 
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 */
 
#import "DigestCommands.h"
 
#import "QCCMD5Digest.h"
#import "QCCSHA1Digest.h"
#import "QCCHMACSHA1Authentication.h"
 
#import "ToolCommon.h"
 
#import "QHex.h"
 
@interface DigestCommand ()
 
+ (Class)digestOperationClass;
 
@end
 
@implementation DigestCommand
 
+ (Class)digestOperationClass
{
    NSAssert(NO, @"implementation required");
    return nil;
}
 
+ (NSString *)commandUsage
{
    return [NSString stringWithFormat:@"%@ file", [self commandName]];
}
 
- (BOOL)validateOptionsAndArguments:(NSArray *)optionsAndArguments
{
    BOOL    success;
    
    success = [super validateOptionsAndArguments:optionsAndArguments];
    if (success && ([self.arguments count] != 1)) {
        success = NO;
    }
    return success;
}
 
- (BOOL)runError:(NSError **)errorPtr
{
    BOOL        success;
    NSData *    data;
    
    data = [NSData dataWithContentsOfURL:[NSURL fileURLWithPath:self.arguments[0]] options:0 error:errorPtr];
    success = (data != nil);
    
    if (success) {
        QCCMD5Digest *      op;
        
        // We're playing fast'n'loose with types here.  The various digest operations 
        // don't share a command base class (becasue I don't want to have them coupled together) 
        // so we don't have a class we can use for "op".  Rather than write lots of pointless 
        // code just to keep the compiler happy, I tell the compile that "op" is of type 
        // QCCMD5Digest.  In reality it could be any of the other digest classes.
        
        op = [[[[self class] digestOperationClass] alloc] initWithInputData:data];
        [[ToolCommon sharedInstance] synchronouslyRunOperation:op];
        fprintf(stdout, "%s\n", [[QHex hexStringWithData:op.outputDigest] UTF8String]);
    }
    
    return success;
}
 
@end
 
@implementation MD5DigestCommand
 
+ (NSString *)commandName
{
    return @"md5-digest";
}
 
+ (Class)digestOperationClass
{
    return [QCCMD5Digest class];
}
 
@end
 
@implementation SHA1DigestCommand
 
+ (NSString *)commandName
{
    return @"sha1-digest";
}
 
+ (Class)digestOperationClass
{
    return [QCCSHA1Digest class];
}
 
@end
 
@interface SHA1HMACCommand ()
 
@property (nonatomic, copy,   readwrite) NSData *       keyData;
 
@end
 
@implementation SHA1HMACCommand
 
+ (NSString *)commandName
{
    return @"hmac-sha1";
}
 
+ (NSString *)commandUsage
{
    return [NSString stringWithFormat:@"%@ -k keyHexStr file", [self commandName]];
}
 
- (NSString *)commandOptions
{
    return @"k:";
}
 
- (BOOL)setOption_k_argument:(NSString *)argument
{
    self.keyData = [QHex dataWithHexString:argument];
    return (self.keyData != nil);
}
 
- (BOOL)validateOptionsAndArguments:(NSArray *)optionsAndArguments
{
    BOOL    success;
    
    success = [super validateOptionsAndArguments:optionsAndArguments];
    if (success) {
        if ([self.arguments count] != 1) {
            success = NO;
        } else if (self.keyData == nil) {
            success = NO;
        }
    }
    return success;
}
 
- (BOOL)runError:(NSError **)errorPtr
{
    BOOL        success;
    NSData *    data;
    
    data = [NSData dataWithContentsOfURL:[NSURL fileURLWithPath:self.arguments[0]] options:0 error:errorPtr];
    success = (data != nil);
    
    if (success) {
        QCCHMACSHA1Authentication *     op;
        
        op = [[QCCHMACSHA1Authentication alloc] initWithInputData:data keyData:self.keyData];
        [[ToolCommon sharedInstance] synchronouslyRunOperation:op];
        fprintf(stdout, "%s\n", [[QHex hexStringWithData:op.outputHMAC] UTF8String]);
    }
    
    return success;
}
 
@end